* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: #e8eded;
}

ul {
    list-style: none;
}

a {
    text-decoration: none;
    color: #333;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: normal;
}

img {
    width: 100%;
}

.course-wrap {
    width: 1200px;
    margin: 50px auto;
}

.course-wrap .course-nav {
    height: 68px;
}

.course-nav .nav-item {
    float: left;
}

.course-nav .nav-item .nav-item-lk {
    display: block;
    height: 68px;
    padding-right: 20px;
    line-height: 68px;
    font-size: 14px;
}

.course-nav .nav-item .nav-item-lk.current {
    color: #2080f7;
}

.course-list-wrap {
    width: 1200px;
}

.course-list-wrap .course-list {
    width: 1220px;
    height: 600px;
}

.course-list-wrap .course-item {
    float: left;
    width: 285px;
    height: 290px;
    margin: 0 20px 20px 0;
    border-radius: 10px;
    overflow: hidden;
    background-color: #fff;
    cursor: pointer;
}

.course-list-wrap .course-item:hover {
    box-shadow: 3px 5px 8px #ccc;
}

.course-list-wrap .course-item .course-item-images {
    position: relative;
}

.course-item-images .classes {
    display: block;
    position: absolute;
    right: 10px;
    bottom: 10px;
    padding: 2px 3px;
    z-index: 1;
    color: #ccc;
    font-size: 10px;
    background-color: rgba(0, 0, 0, .5);
    border-radius: 5px;
}

.course-item .course-item-bottom {
    padding: 10px;
}

.course-item-bottom .course-item-tt {
    height: 48px;
    overflow: hidden;
}

.course-item-bottom .course-item-tt a {
    font-weight: 500;
    font-size: 20px;
    line-height: 24px;
}

.course-item-bottom .course-item-tt a:hover {
    color: #2080f7;
}

.course-item-bottom .info {
    margin-top: 20px;
}

.course-item-bottom .info .price {
    font-size: 16px;
    line-height: 20px;
    color: #ff7a38;
}

.course-item-bottom .info .student-num {
    font-size: 14px;
    line-height: 20px;
    color: #a1a9b2;
}